3y-4+4y-17=90

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Solution for 3y-4+4y-17=90 equation:


Simplifying
3y + -4 + 4y + -17 = 90

Reorder the terms:
-4 + -17 + 3y + 4y = 90

Combine like terms: -4 + -17 = -21
-21 + 3y + 4y = 90

Combine like terms: 3y + 4y = 7y
-21 + 7y = 90

Solving
-21 + 7y = 90

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + 7y = 90 + 21

Combine like terms: -21 + 21 = 0
0 + 7y = 90 + 21
7y = 90 + 21

Combine like terms: 90 + 21 = 111
7y = 111

Divide each side by '7'.
y = 15.85714286

Simplifying
y = 15.85714286

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